tee: add OP-TEE driver

Adds a OP-TEE driver.

* Targets ARM and ARM64
* Supports using any U-Boot memory as shared memory
* Probes OP-TEE version using SMCs
* Uses OPTEE message protocol version 2 to communicate with secure world

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Igor Opaniuk <igor.opaniuk@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

1 files changed, 93 insertions, 0 deletions

diff --git a/drivers/tee/optee/supplicant.c b/drivers/tee/optee/supplicant.c
new file mode 100644
index 00000000000..2239b1bf7b3
--- /dev/null
+++ b/drivers/tee/optee/supplicant.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (c) 2018, Linaro Limited
+ */
+
+#include <common.h>
+#include <log.h>
+#include <tee.h>
+#include <linux/types.h>
+
+#include "optee_msg.h"
+#include "optee_msg_supplicant.h"
+#include "optee_private.h"
+#include "optee_smc.h"
+
+static void cmd_shm_alloc(struct udevice *dev, struct optee_msg_arg *arg,
+			  void **page_list)
+{
+	int rc;
+	struct tee_shm *shm;
+	void *pl;
+	u64 ph_ptr;
+
+	arg->ret_origin = TEE_ORIGIN_COMMS;
+
+	if (arg->num_params != 1 ||
+	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
+		arg->ret = TEE_ERROR_BAD_PARAMETERS;
+		return;
+	}
+
+	rc = __tee_shm_add(dev, 0, NULL, arg->params[0].u.value.b,
+			   TEE_SHM_REGISTER | TEE_SHM_ALLOC, &shm);
+	if (rc) {
+		if (rc == -ENOMEM)
+			arg->ret = TEE_ERROR_OUT_OF_MEMORY;
+		else
+			arg->ret = TEE_ERROR_GENERIC;
+		return;
+	}
+
+	pl = optee_alloc_and_init_page_list(shm->addr, shm->size, &ph_ptr);
+	if (!pl) {
+		arg->ret = TEE_ERROR_OUT_OF_MEMORY;
+		tee_shm_free(shm);
+		return;
+	}
+
+	*page_list = pl;
+	arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
+			      OPTEE_MSG_ATTR_NONCONTIG;
+	arg->params[0].u.tmem.buf_ptr = ph_ptr;
+	arg->params[0].u.tmem.size = shm->size;
+	arg->params[0].u.tmem.shm_ref = (ulong)shm;
+	arg->ret = TEE_SUCCESS;
+}
+
+static void cmd_shm_free(struct optee_msg_arg *arg)
+{
+	arg->ret_origin = TEE_ORIGIN_COMMS;
+
+	if (arg->num_params != 1 ||
+	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
+		arg->ret = TEE_ERROR_BAD_PARAMETERS;
+		return;
+	}
+
+	tee_shm_free((struct tee_shm *)(ulong)arg->params[0].u.value.b);
+	arg->ret = TEE_SUCCESS;
+}
+
+void optee_suppl_cmd(struct udevice *dev, struct tee_shm *shm_arg,
+		     void **page_list)
+{
+	struct optee_msg_arg *arg = shm_arg->addr;
+
+	switch (arg->cmd) {
+	case OPTEE_MSG_RPC_CMD_SHM_ALLOC:
+		cmd_shm_alloc(dev, arg, page_list);
+		break;
+	case OPTEE_MSG_RPC_CMD_SHM_FREE:
+		cmd_shm_free(arg);
+		break;
+	case OPTEE_MSG_RPC_CMD_FS:
+		debug("OPTEE_MSG_RPC_CMD_FS not implemented\n");
+		arg->ret = TEE_ERROR_NOT_IMPLEMENTED;
+		break;
+	default:
+		arg->ret = TEE_ERROR_NOT_IMPLEMENTED;
+	}
+
+	arg->ret_origin = TEE_ORIGIN_COMMS;
+}